<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll" />
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keyup.enter="enterFn"
      v-model="msg"
    />
  </header>
</template>

<script>
export default {
  props: {
    arr: {
      type: Array,
      required: true,
    },
  },
  data() {
    return {
      msg: "",
    };
  },
  methods: {
    enterFn() {
      if (this.msg.trim() === "") return alert("请输入数据");
      this.$emit("add", this.msg);
      this.msg = "";
    },
  },
  computed: {
    isAll: {
      set(val) {
        return this.arr.forEach((item) => (item.isDone = val));
      },
      get() {
        return this.arr.every((item) => item.isDone === true);
      },
    },
  },
};
</script>